Friendly, need to show your project skills and experience. Having discussion with them and also get some suggestions from them. Good experience. Nees to show your passion in this internship position. Since this is a high quality company, so need well prepared for the interview

They will ask though questions need to be well prepared. Interviewer is friendly, Have to present code and explain on it, even test you on parts. Interviewer will provide feedback on your code on improvements.